mysql create user if not exists

Question

I have a query to check mysql users list for create new user.

IF (SELECT EXISTS(SELECT 1 FROM `mysql`.`user` WHERE `user` = '{{ title }}')) = 0 THEN     CREATE USER '{{ title }}'@'localhost' IDENTIFIED BY '{{ password }}' END IF; 

But i get this error:

ERROR 1064 (42000) at line 3: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IF (SELECT EXISTS(SELECT 1 FROM `mysql`.`user` WHERE `user` = 'cms_localhost')) = 0 ' at line 1 

Answer 1

In 5.7.6 and above, you should be able to use CREATE USER

CREATE USER IF NOT EXISTS 'user'@'localhost' IDENTIFIED BY 'password'; 

Note that the 5.7.6 method doesn't actually grant any permissions.

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If you aren't using a version which has this capability (something below 5.7.6), you can do the following:

GRANT ALL ON `database`.* TO 'user'@'localhost' IDENTIFIED BY 'password'; 

This will create the user if it doesn't exist

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Note, if you are on MySQL 8, the GRANT ALL method will not create a user.